[rollei_list] Re: OT: Newton rings

I have an Epson scanner and never got Newton rings using the scanner film 
holder, sometimes, only sometimes, I got them scanning film on the glass 
surface directly (I do it if the film is flat enough), even for these cases I 
could reduce the number of scannings showing Newton rings cleaning the film 
surface and the scanner glass surface carefuly despite they look clean, main 
cause for Newton rings are dust, grease/oil and humidity on both or one of the 
surfaces, I don't think film emulsion up or down have something to do with the 
problem, except if one of the sides is cleaner than other; a simple dust speck 
can cause a Newton ring if both surfaces have contact, however it never 
happened to me using the film holder.

Carlos   

--- El lun 1-jun-09, Don Williams <dwilli10@xxxxxxx> escribió:

> De: Don Williams <dwilli10@xxxxxxx>
> Asunto: [rollei_list] Re: OT: Newton rings
> Para: rollei_list@xxxxxxxxxxxxx
> Fecha: lunes, 1 de junio de 2009, 2:04 pm
> 
>  
> At 02:08 AM 6/1/2009, Michiel wrote:
> 
> I don't
> know the scanner but
> I've had this also with my Epson flatbed.
> 
> If the negatives are a bit curled he shiny side might touch
> the glass of
> the scanner. This can cause the rings. flip the negative
> over with the
> not shiny side down. Mirror in PS and you're done.
> 
> Or your negative carrier has glass in it which causes the
> rings. hen you
> need AN glass on the shiny side of the negatives.
> 
> 
> Cheers,
> 
> 
> Michiel Fokkema
> 
> Once more, it has to do with the texture of the surface
> facing the
> glass.  Strange to say, I made a list of reminders for
> my Epson and
> I show the emulsion side to be down.  
> 
> 
> Even more strange, and I can't explain it, there is an
> incredible depth
> of focus in the scanner.  I can scan slides of all
> sizes in mounts,
> and the adapters for strips of film place the film nearly
> 1/16"
> above the glass.  I've asked the group how this
> can be but never got
> an answer, even from a couple of folks who were involved in
> designing the
> scanners.
> 
> 
> None of my film or transparency adapters have glass in
> them.
> 
> 
> DAW
> 
> 
>  
> 
> 


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